Hygrothermograph



FIG. 1 is a front elevational view of a hygrothermograph, showing my design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a rear perspective view thereof showing the hygrothermograph in an alternate orientation;

FIG. 5 is a rear perspective view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a left side elevational view thereof;

FIG. 8 is a top plan view thereof; and,

FIG. 9 is a bottom plan view thereof. 

CLAIM The ornamental design for a hygrothermograph, as shown and described. 